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US9287559B2 - Lithium secondary battery - Google Patents

Lithium secondary battery Download PDF

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US9287559B2
US9287559B2 US14/026,020 US201314026020A US9287559B2 US 9287559 B2 US9287559 B2 US 9287559B2 US 201314026020 A US201314026020 A US 201314026020A US 9287559 B2 US9287559 B2 US 9287559B2
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positive electrode
secondary battery
lithium secondary
active material
electrode active
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US20140030588A1 (en
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Yeon Suk Hong
Jae Seung Oh
Hyo Jin Lee
Byoung Bae Lee
You Jin Shim
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LG Energy Solution Ltd
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    • H01M10/05—Accumulators with non-aqueous electrolyte
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    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
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    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
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    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/362—Composites
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    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
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    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
    • H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
    • H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
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    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
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    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
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    • H01M2004/021—Physical characteristics, e.g. porosity, surface area
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    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/028—Positive electrodes
    • H—ELECTRICITY
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    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H—ELECTRICITY
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    • H01M2300/00—Electrolytes
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    • H01M2300/0025—Organic electrolyte
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    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0025—Organic electrolyte
    • H01M2300/0028—Organic electrolyte characterised by the solvent
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y02E60/122—

Definitions

  • the present invention relates to a lithium secondary battery comprising a positive electrode, a negative electrode, a non-aqueous electrolyte comprising a non-aqueous organic solvent and a lithium salt, and more particularly to a lithium secondary battery comprising a positive electrode comprising a positive electrode active material of a three-component system and a non-aqueous electrolyte comprising an additive for deactivating a transition metal comprised in the positive electrode active material, thereby improving a cycle lifetime and preventing the lithium secondary battery from swelling phenomenon.
  • a lithium secondary battery developed during the early 1990s comprises a negative electrode made by using a carbon material capable of absorbing and desorbing lithium ions, a positive electrode made by using a positive electrode active material and a non-aqueous electrolyte comprising a lithium salt dissolved in a mixed organic solvent.
  • lithium secondary batteries maintaining good properties at a severe environment comprising a high temperature and a low temperature, and capable of stable charging at a high voltage is gradually increasing.
  • the capacity of the positive electrode active materials may be increased as a charging potential increases, however, the desorbing of the transition metal oxides constituting the positive electrode active material also may be accelerated to induce a structural instability.
  • organic solvents used as the non-aqueous electrolyte of the lithium secondary battery such as ethylene carbonate, propylene carbonate, dimethoxy ethane, ⁇ -butyrolactone, N,N-dimethyl formamide, tetrahydrofuran or acetonitrile may be oxidized by emitted transition metal oxides and generate a gas when stored at a high temperature for a long time. Due to the generated gas, a battery assembly (battery parts) may be deformed to induce an internal short, and the battery may be deteriorated. In severe cases, the battery may be ignited or exploded. The oxidation reaction of the electrolyte may be accelerated as the amount of the transition metal eluted under high voltage conditions increases.
  • organic solvents used as the non-aqueous electrolyte of the lithium secondary battery such as ethylene carbonate, propylene carbonate, dimethoxy ethane, ⁇ -butyrolactone, N,N-dimethyl formamide, t
  • An object of the present invention is to provide a lithium secondary battery capable of preventing the swelling phenomenon of the battery due to generated gas during storing at a high temperature and having improved charge/discharge performance and cycle lifetime after storing at the high temperature for a long time.
  • a lithium secondary battery comprising a positive electrode, a negative electrode, a separator inserted between the positive electrode and the negative electrode and a non-aqueous electrolyte.
  • the positive electrode comprises a first positive electrode active material represented by the following Chemical Formula 1
  • the non-aqueous electrolyte comprises a first lithium salt, a second lithium salt represented by the following Chemical Formula 2 and a non-aqueous organic solvent.
  • FIG. 1 is a graph illustrating a cell thickness change with respect to the storing time of batteries manufactured according to example embodiments of the present invention and a comparative example.
  • FIG. 2 is a graph illustrating charge/discharge capacity with respect to charge/discharge cycle of batteries manufactured according to an example embodiment of the present and a comparative example.
  • a lithium secondary battery comprising a positive electrode, a negative electrode, a separator inserted between the positive electrode and the negative electrode and a non-aqueous electrolyte.
  • the positive electrode comprises a first positive electrode active material represented by the following Chemical Formula 1
  • the non-aqueous electrolyte comprises a first lithium salt, a second lithium salt represented by the following Chemical Formula 2 and a non-aqueous organic solvent.
  • the first positive electrode active material may be an active material of a three component system represented by Li 1+x (Ni a Mn b Co 1-a-b-x )O 2 ( ⁇ 0.1 ⁇ x ⁇ 0.1, 0 ⁇ a ⁇ 1, 0 ⁇ x+a+b ⁇ 1) or Li 1+x (Mn 2-x-y Co y )O 4 ( ⁇ 0.1 ⁇ x ⁇ 0.1, 0 ⁇ y ⁇ 2).
  • a cut diameter (D 50 ) of the first positive electrode active material may be less than or equal to 8 ⁇ m and particularly may be 4 to 7 ⁇ m, and the particle type of the first positive electrode active material may have an agglomerated structure of minute particles. Particularly, the first positive electrode active material may have an agglomerated structure of 90% or more of minute particles having a size of 1 to 4 ⁇ m.
  • the positive electrode may further comprise a second positive electrode active material represented by the following Chemical Formula 3a or 3b.
  • a second positive electrode active material represented by the following Chemical Formula 3a or 3b.
  • Examples on the second positive electrode active material may comprise Li x Co 2 O 2 (0.5 ⁇ x ⁇ 1.3), Li x NiO 2 (0.5 ⁇ x ⁇ 1.3), Li x MnO 2 (0.5 ⁇ x ⁇ 1.3), Li x Mn 2 O 4 (0.5 ⁇ x ⁇ 1.3), Li x Ni 1-r Co r O 2 (0.5 ⁇ x ⁇ 1.3, 0 ⁇ r ⁇ 1), Li x Co 1-r Mn r O 2 (0.5 ⁇ x ⁇ 1.3, 0 ⁇ r ⁇ 1), Li x Ni 1-r Mn r O 2 (0.5 ⁇ x ⁇ 1.3, 0 ⁇ r ⁇ 1), Li x Mn 2-p Ni p O 4 (0.5 ⁇ x ⁇ 1.3, 0 ⁇ p ⁇ 2) and Li x Mn 2-p Co p O 4 (0.5 ⁇ x ⁇ 1.3, 0 ⁇ p ⁇ 2).
  • the cut diameter (D 50 ) of the second positive electrode active material may be greater than or equal to 15 ⁇ m and particularly may be 20 to 30 ⁇ m, and the second positive electrode active material may comprise monolithic phase particles.
  • a relative weight ratio of the first positive electrode active material:the second positive electrode active material may be 10:90 to 50:50 and particularly may be 50:50 to 30:70.
  • the amount ratio of the first positive electrode active material is less than 10
  • the amount of the other metal component Co constituting the three component system may be increased, and cost reduction effect may be decreased.
  • the amount ratio of the first positive electrode active material exceeds 50, a gas may be generated when stored at a high temperature.
  • the surfaces of the first positive electrode active material and the second positive electrode active material may be coated with a metal such as aluminum (Al) or a metal oxide by known methods.
  • Ni 2+ and Ni 3+ coexist, and a portion of the Ni 2+ may be inserted in an absorbing and desorbing layer (reversible lithium layer). Since the Ni 2+ has a very similar size as the lithium ion (Li + ), the inserted Ni 2+ in the reversible lithium layer may not transform a crystalline structure while preventing the breaking of the crystalline structure due to the repulsive force of the transition metal oxide layer (MO layer) after the desorbing of the lithium ions during charging. Thus, an appropriate amount of the Ni 2+ is preferably comprised so as to support a gap between the MO layers stably.
  • an appropriate amount of the Ni 2+ is preferably comprised so as not to inhibit the reversible absorbing and desorbing of the lithium ions at the lithium layer. That is, when the molar fraction of the inserted Ni 2+ in the reversible lithium layer is too high, the insertion of the Ni 2+ may be increased to inhibit the charging and the discharging and to decrease a discharge capacity. Thus, the molar fraction of the Ni 2+ inserted in the reversible lithium layer is 0.03 to 0.07 based on the total amount of Ni. When the molar fraction of the Ni 2+ exceeds 0.07, the initial capacity of the battery may be decreased.
  • the positive electrode may further comprise a third positive electrode active material represented by the following Chemical Formula 4. LiNi o M 3 P O 2 [Chemical Formula 4]
  • M 3 is Co or Fe, and 0.7 ⁇ o ⁇ 0.8, 0.2 ⁇ P ⁇ 0.3)
  • the lithium secondary battery may additionally comprise a sulfide, a selenide, a halide, and the like as the positive electrode active material of the secondary battery of the present invention besides the lithium-containing transition metal oxide such as the first to third positive electrode active materials.
  • the first lithium salt comprised in the non-aqueous electrolyte may comprise lithium salts commonly used in an electrolyte of a common lithium secondary battery without limitation, for example, Li + cation and at least one anion selected from the group consisting of F ⁇ , Cl ⁇ , Br ⁇ , I ⁇ , NO 3 ⁇ , N(CN) 2 ⁇ , BF 4 ⁇ , F 2 BO 4 ⁇ , B(O 4 ) 2 ⁇ , ClO 4 ⁇ , PF 6 ⁇ , (CH 3 ) 2 PF 4 ⁇ , (CF 3 ) 3 PF 3 ⁇ , (CF 3 ) 4 PF 2 ⁇ , (CF 3 ) 5 PF ⁇ , (CF 3 ) 6 P ⁇ , CF 3 SO 3 ⁇ , CF 3 CF 2 SO 3 ⁇ , (CF 3 SO 2 ) 2 N ⁇ , (FO 2 ) 2 N ⁇ ,
  • the first lithium salt may be comprised in the non-aqueous electrolyte by about 10 wt %.
  • the second lithium salt may comprise lithium acetate, lithium trifluoroacetate (LiCF 3 COO), lithium octanoate or a mixture thereof.
  • the amount of the second lithium salt may be 0.01 to 2.0 wt %, particularly may be 0.05 to 0.5 wt %, based on the total amount of the non-aqueous electrolyte.
  • the amount of the second lithium salt is less than 0.01 wt %, the swelling restraining effect of the battery at a high temperature may be insufficient.
  • the amount exceeds 2.0 wt % the conductivity of an electrolyte may be largely decreased due to the second lithium salt having a relatively small dissociation degree.
  • the initial capacity of the battery may be decreased due to the formation of a thick coating layer on the positive electrode by RCOO ⁇ anion.
  • the non-aqueous organic solvent comprised in the non-aqueous electrolyte may comprise any organic solvents commonly used as the electrolyte for a lithium secondary battery without limitation, and may typically comprise an ether compound, an ester compound, a linear carbonate compound, a cyclic carbonate compound, an amide compound and the like.
  • the ether compound may comprise at least one compound selected from the group consisting of dimethyl ether, diethyl ether, dipropyl ether, methyl ethyl ether, methyl propyl ether, and ethyl propyl ether.
  • the ester compound may comprise at least one compound selected from the group consisting of methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, ⁇ -butyrolactone, ⁇ -valerolactone, ⁇ -caprolactone, ⁇ -valerolactone and ⁇ -caprolactone.
  • the linear carbonate compound may comprise at least one compound selected from the group consisting of diethyl carbonate, dimethyl carbonate, ethyl methyl carbonate, methyl propyl carbonate, and dipropyl carbonate.
  • cyclic carbonate compound may comprise at least one compound selected from the group consisting of propylene carbonate, ethylene carbonate, 1,2-butylene carbonate, 2,3-butylene carbonate, 1,2-pentylene carbonate, 2,3-pentylene carbonate, vinylene carbonate and a halogenated compound thereof.
  • the organic solvent used in the electrolyte for the lithium secondary battery of the present invention may comprise the linear carbonate and the cyclic carbonate, or a mixture thereof. More particularly, the organic solvent used in the electrolyte for the lithium secondary battery of the present invention, may comprise the cyclic carbonate such as ethylene carbonate and propylene carbonate, which has a high viscosity and a high dielectric constant and dissociates the lithium salt in the electrolyte very well, or may comprise both the cyclic carbonate and the linear carbonate such as dimethyl carbonate and diethyl carbonate, which has a low viscosity and a low dielectric constant at an appropriate mixing ratio to prepare an electrolyte having a high electric conductivity.
  • the organic solvent used in the electrolyte for the lithium secondary battery of the present invention may comprise the linear carbonate and the cyclic carbonate, or a mixture thereof. More particularly, the organic solvent used in the electrolyte for the lithium secondary battery of the present invention, may comprise the cyclic carbonate such as
  • the non-aqueous organic solvent may further comprise at least one compound selected from the group consisting of vinylene carbonate, dimethyl sulfoxide, acetonitrile, dimethoxyethane, diethoxyethane, sulfolane, propylene sulfite and tetrahydrofuran.
  • the non-aqueous electrolyte of the present invention may further comprise an additive capable of forming a passivation layer on the surface of the negative electrode.
  • the additive may comprise a carbonate compound such as fluoroethylene carbonate, vinylethylene carbonate, and the like; a sulfur (S)-based compound such as propane sultone, ethylene sulfite, and 1,3-propane sultone; or a lactam compound such as N-acetyl lactam.
  • the organic solvent used in a non-aqueous electrolyte of a common lithium secondary battery may be oxidized and decomposed at the surface of a positive electrode through the repetition of charging and discharging.
  • a lithium transition metal oxide is used as the positive electrode active material, the oxidation and decomposition reaction of the organic solvent by the transition metal at a high temperature may be accelerated. In this case, the transform of the battery and the ignition or explosion of the battery may be induced.
  • RCOO ⁇ illustrates a bonding energy with the transition metal component of the positive electrode active material (Mn, Ni, Co) of four times or over in the non-aqueous electrolyte having a dielectricity ( ⁇ ) of about 20 to 30 when compared with the first lithium salt Li + PF 6 ⁇ (see Table 1).
  • the non-aqueous electrolyte comprising the second lithium salt of the present invention may form a complex at the surface of the positive electrode comprising the lithium transition metal oxide more easily than the non-aqueous electrolyte comprising the first lithium salt alone. Accordingly, the transition metal comprised in the positive electrode active material may be deactivated, and the oxidation reaction of the electrolyte may be prevented. As the result, the generation of a gas in a battery while storing at a high temperature may be prevented, and the inner short or the explosion of the battery due to the deformation of the battery (the swelling phenomenon of the battery) may be improved.
  • the negative electrode comprising the negative electrode active material and the separator constituting the lithium secondary battery of the present invention may employ commonly used ones for the manufacture of the lithium secondary battery.
  • the negative electrode active material may comprise a carbon material, a lithium metal, silicon, tin or a metal oxide, which may commonly conduct the absorbing and the desorbing of lithium ions, and may also comprise a metal oxide such as TiO 2 , SnO 2 , etc. having a potential of 2V or less with respect to lithium.
  • the carbon material may comprise at least one carbon having a low crystallinity selected from soft carbon and hard carbon, or at least one carbon having a high crystallinity selected from the group consisting of natural graphite, kish graphite, pyrolytic carbon, a mesophase pitch based carbon fiber, meso-carbon microbeads, mesophase pitches and petroleum or coal tar pitch derived cokes.
  • the positive electrode and the negative electrode may further use a binder polymer.
  • Typical examples of the binder polymer comprise at least one selected from the group consisting of a vinylidene fluoride-hexafluoropropylene copolymer (PVDF-co-HFP), polyvinylidene fluoride, polyacrylonitrile, and polymethyl methacrylate.
  • the separator may be formed by a commonly used porous polymer film as the separator, for example, a porous polymer film manufactured by using a polyolefin polymer selected from the group consisting of ethylene homopolymer, propylene homopolymer, ethylene/butene copolymer, ethylene/hexene copolymer and ethylene/methacrylate copolymer, alone or a laminated type; or by using a porous non-woven fabric formed by using a high melting point glass fiber and a polyethylene terephthalate fiber, without limitation.
  • a porous polymer film manufactured by using a polyolefin polymer selected from the group consisting of ethylene homopolymer, propylene homopolymer, ethylene/butene copolymer, ethylene/hexene copolymer and ethylene/methacrylate copolymer, alone or a laminated type; or by using a porous non-woven fabric formed by using a high melting point glass fiber and a
  • the external shape of the lithium secondary battery according to the present invention is not limited to any shapes and may comprise a cylindrical shape using a can, a polygonal shape, a pouch shape or a coin shape.
  • a lithium secondary battery comprises a positive electrode comprising a positive electrode active material of a three component system and a non-aqueous electrolyte comprising an additive capable of deactivating a transition metal, thereby providing a swelling restraining phenomenon and an improved cycle lifetime.
  • a positive electrode active material slurry was prepared by mixing LiNi 0.50 CO 0.2 Mn 0.27 O 2 (D 50 is 5 to 8 ⁇ m), which is an agglomerated body of minute particles of 1 to 2 ⁇ m, as a first positive electrode active material, and LiCoO 2 (D 50 is 15 to 20 ⁇ m) having a monolithic phase structure, as a second positive electrode active material, by the weight ratio of 30:70.
  • the obtained slurry was coated on an aluminum plate, dried and rolled to manufacture a positive electrode.
  • a natural graphite, a styrene-butadiene rubber as a binder and carboxymethyl cellulose as a viscosity increasing agent were mixed by the weight ratio of 96:2:2 and dispersed in water to prepare a negative electrode slurry.
  • the obtained slurry was coated on a copper foil having a thickness of 10 ⁇ m, dried and rolled to manufacture a negative electrode.
  • a polymer battery was manufactured by using the thus manufactured positive electrode, and the negative electrode along with a porous separator by means of a common method. Then, the non-aqueous electrolyte of step (1) was injected to manufacture a battery according to the present invention.
  • a positive electrode active material slurry was prepared by mixing LiNi 0.53 CO 0.2 Mn 0.27 O 2 (D 50 is 5 to 8 ⁇ m), which is an agglomerated body of minute particles of 1 to 2 ⁇ m, as a first positive electrode active material, and LiCoO 2 (D 50 is 15 to 20 ⁇ m) having a monolithic phase structure, as a second positive electrode active material, by the weight ratio of 30:70.
  • the obtained slurry was coated on an aluminum plate, dried and rolled to manufacture a positive electrode.
  • a natural graphite, a styrene-butadiene rubber as a binder and carboxymethyl cellulose as a viscosity increasing agent were mixed by the weight ratio of 96:2:2 and dispersed in water to prepare a negative electrode slurry.
  • the obtained slurry was coated on a copper foil having a thickness of 10 ⁇ m, dried and rolled to manufacture a negative electrode.
  • a polymer battery was manufactured by using the thus manufactured positive electrode, and the negative electrode along with a porous separator by means of a common method. Then, the non-aqueous electrolyte of step (1) was injected to manufacture a battery according to the present invention.
  • a positive electrode active material slurry was prepared by mixing LiNi 0.50 CO 0.2 Mn 0.27 O 2 (D 50 is 5 to 8 ⁇ m), which is an agglomerated body of minute particles of 1 to 2 ⁇ m, as a first positive electrode active material, LiCoO 2 (D 50 is 15 to 20 ⁇ m) having a monolithic phase structure, as a second positive electrode active material, and LiNi 0.8 CO 0.15 Al 0.05 O 2 (D 50 is 10 to 15 ⁇ m) as a third positive electrode active material, by the weight ratio of 30:50:20.
  • the obtained slurry was coated on an aluminum plate, dried and rolled to manufacture a positive electrode.
  • a natural graphite, a styrene-butadiene rubber as a binder and carboxymethyl cellulose as a viscosity increasing agent were mixed by the weight ratio of 96:2:2 and dispersed in water to prepare a negative electrode slurry.
  • the obtained slurry was coated on a copper foil having a thickness of 10 ⁇ m, dried and rolled to manufacture a negative electrode.
  • a polymer battery was manufactured by using the thus manufactured positive electrode, and the negative electrode along with a porous separator by means of a common method. Then, the non-aqueous electrolyte of step (1) was injected to manufacture a battery according to the present invention.
  • a positive electrode active material slurry was prepared by mixing LiNi 0.50 CO 0.2 Mn 0.27 O 2 (D 50 is 5 to 8 ⁇ m), which is an agglomerated body of minute particles of 1 to 2 ⁇ m, as a first positive electrode active material, and LiCoO 2 (D 50 is 15 to 20 ⁇ m) having a monolithic phase structure, as a second positive electrode active material, by the weight ratio of 30:70.
  • the thus obtained slurry was coated on an aluminum plate, dried and rolled to manufacture a positive electrode.
  • a natural graphite, a styrene-butadiene rubber as a binder and carboxymethyl cellulose as a viscosity increasing agent were mixed by the weight ratio of 96:2:2 and dispersed in water to prepare a negative electrode slurry.
  • the obtained slurry was coated on a copper foil having a thickness of 10 ⁇ m, dried and rolled to manufacture a negative electrode.
  • a polymer battery was manufactured by using the thus manufactured positive electrode, and the negative electrode along with a porous separator by means of a common method. Then, the non-aqueous electrolyte was injected to manufacture a battery.
  • the anion, RCOO ⁇ of the second lithium salt has a greater bonding energy with respect to the transition metal components of the positive electrode active material, Mn, Ni, and Co, by four times when compared with the anion, PF 6 ⁇ of the first lithium salt.
  • the thickness change (the swelling degree of battery) with respect to time was measured for the batteries manufactured according to Examples 1 to 3 and Comparative Example 1 under a high temperature and high voltage condition as follows.
  • the test was conducted as follows. Each of the batteries was charged by 4.20 V, heated to 90° C. at a temperature increasing rate of 1° C./min, stored at 90° C. for four hours, and cooled to room temperature for 1 hour.
  • the swelling degree of the battery was illustrated by a maximum thickness change ( ⁇ T) with respect to an initial thickness (see the following Table 2 and FIG. 1 ).
  • the batteries comprising the electrolyte comprising the second lithium salt according to Examples 1 to 3 were confirmed to illustrate not much thickness change (that is, the swelling degree of battery) even though stored at a high temperature for a long time when compared with the battery of Comparative Example 1.
  • the charge/discharge cycle lifetimes of the batteries manufactured according to Examples 1 to 3 and Comparative Example 1 were measured at 45° C. with a voltage range of 3.0 to 4.2 V.
  • the charge/discharge capacity maintaining ratios with respect to an initial capacity are illustrated in the following Table 3 and FIG. 2 .
  • the battery comprising the electrolyte comprising the second lithium salt according to the present invention has an improving effect of charge/discharge lifetime (capacity maintaining ratio) at a high temperature.

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EP3728134B1 (fr) 2017-12-22 2023-08-23 Umicore Matériau d'électrode positive pour batteries lithium-ion rechargeables et ses procédés de production
KR102521605B1 (ko) 2018-03-02 2023-04-12 유미코아 재충전가능 리튬 이온 배터리용 양극 물질
JP7202393B2 (ja) 2018-03-29 2023-01-11 ユミコア 充電式リチウムイオン電池用の正極材料を調製する方法
CN113678286B (zh) * 2019-03-07 2024-10-15 株式会社Lg新能源 锂二次电池
CN109921024B (zh) * 2019-03-12 2020-12-29 北京科技大学 一种应用于电池的柔性固态锂离子导体及其制备方法
JP7216805B2 (ja) * 2019-03-29 2023-02-01 三井化学株式会社 電池用非水電解液及びリチウム二次電池
KR102752642B1 (ko) * 2019-09-11 2025-01-10 주식회사 엘지에너지솔루션 이차전지용 양극재 및 이를 포함하는 리튬 이차전지
EP4280367A3 (fr) 2019-09-13 2024-01-24 Asahi Kasei Kabushiki Kaisha Solution électrolytique non-aqueuse et batterie secondaire à électrolyte non-aqueux
CN119812437A (zh) * 2021-07-21 2025-04-11 株式会社Lg新能源 锂二次电池
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